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Hasegawa, Hiroaki
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Experimental Study of Aerodynamic Drag Control on Bluff Body using Synthetic Jets

Utsunomiya University-Naoto Kato, Shunsuke Watanabe, Hiroaki Hasegawa
  • Technical Paper
  • 2019-32-0538
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
Since flow separation causes increase of the drag on bluff bodies, its control method has been studied for many years. Active control methods are currently focused as an alternative to passive ones because they impose a larger drag penalty under certain conditions. Although the effectiveness of a steady jet using suction, blowing or pulsed jets has been demonstrated, it is difficult to obtain an effect commensurate with weight increase because the mechanism is complicated.One method of solving this problem is a synthetic jet. Synthetic jets are produced by periodic ejection and suction of fluid from an orifice induced by oscillation of a diaphragm inside a cavity. Small engine powered vehicles demand less drag, a compact package and light weight because the drivers expect fuel efficiency, load capacity and economy. Synthetic jets can supply them because they contribute drag reduction and require only simple components.In this study, the influence of synthetic jets on the drag of a simple bluff body representing a road vehicle is measured. Drag measurement was performed by varying synthetic jet parameters: jet…
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Four Stroke Cycle Gasoline Engine Oils for Motorcycle

F.C.C. Co.,Ltd.-Tadao Isobe, Mitsuyoshi Nakamura, Hiroaki Hasegawa
Honda R&D Co.,Ltd.-Masatoshi Akagi
Published 2006-11-13 by SAE International in United States
Conventionally, the engine oils for passenger cars have been used as four stroke cycle gasoline engine oils for motorcycle from old-time. However, the engine oils for passenger cars have been required to have fuel economy performance, and these engine oils are not fit in the requirement of motorcycles because of low friction and low viscosity. For this reason the four stroke cycle gasoline engine oils for motorcycles have been classified into two categories of ‘MA’ and ‘MB’ based on differences in friction characteristics according to standard of Japan Automobile Standards Organization (hereinafter referred to as ‘JASO’) -JASO T 903:1998. In currently, some engine oils for passenger cars can fit in JASO standard, but the range of friction coefficient in MA category is becoming wider. When such a low-viscosity, low-friction coefficient engine oil is used in four stroke cycle engines for motorcycles in which the same engine oil is commonly used for lubricating of the engine, the clutch and the transmission, the clutch slipping may occur because of the low friction coefficient or the gear durability…
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Study on the Dynamic Property of a Paper-Based Wet Clutch

Tatsuhito Miura, Noboru Sekine, Toshiaki Azegami, Yasunori Murakami, Kazuhiro Itonaga, Hiroaki Hasegawa
Published 1998-02-23 by SAE International in United States
The effect of the groove configuration of segment bonded type paper-based wet clutches and porosity of friction materials on dynamic friction properties was evaluated in this paper. This evaluation was carried out through visualization of the sliding interface of the clutch disk and measurement of the automatic transmission fluid (ATF) velocity into the lining at the surface of friction plate. This evaluation founded that friction plate configurations with large numbers of grooves (small segments) exhibited stable dynamic friction properties with respect to changes in the oil permeation speed at the friction interfaces.
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Paper-Based Wet Clutch Characteristics for Automatic Transmission

F.C.C. Co., Ltd.-Kazuhiro Itonaga, Hiroaki Hasegawa
Honda R&D Co., Ltd.-Tatsuhito Miura, Toshiaki Azegami, Yasunori Murakami
  • Technical Paper
  • 978003
Published 1997-05-21 by Society of Automotive Engineers of Japan in Japan
Paper-based wet friction materials are used for various types of wet clutches in automotive automatic transmissions. In this report, we studied the influence of groove pattern and porosity of paper-based friction materials for wet clutches.